2013/01/01 by Camila do Nascimento Moreira, Camilla Bruno Di‐Nizo, Maria José de Jesus Silva +2 · 1 citation
Biochemistry, Genetics and Molecular Biology · Agricultural and Biological Sciences · #Genetic diversity and population structure #Chromosomal and Genetic Variations #Genetic Mapping and Diversity in Plants and Animals
paper · pdf · doi:10.1590/s1415-47572013000200010
openalex publication_date 2013/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/02
Pseudoryzomys simplex, the false rice rat, is a monotypic genus of the Oryzomyini tribe (Sigmodontinae) distributed in part of Bolivia, Paraguay, Argentina and Brazil. Its diploid number has been described as 56 acrocentric chromosomes decreasing in size and no karyotype figure has been depicted. Herein, we present karyotypic data on P. simplex, including chromosome banding and molecular fluorescent in situ hybridization using telomeric sequences and the whole X-chromosome of its sister clade Holochilus brasiliensis (HBR) as probes. A case of remarkable autosomal heteromorphism due to the presence of a whole heterochromatic arm leading to the variability of FN is reported, as well as the occurrence of regions of homology between the X and Y chromosomes (pseudoautosomal regions) after chromosome painting with the HBR X probe on P. simplex metaphases.